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If a2+ab+b2=19a^{2} + ab + b^{2} = 19 a2+ab+b2=19 a4+a2b2+b4=133a^{4}+a^{2}b^{2}+b^{4} = 133a4+a2b2+b4=133
then what is the value of ab\boxed{ab}ab ???
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